Reductive decomposition of calcium sulfate utilizing carbon monoxide and hydrogen

Diaz-Bossio, Luis M.; Squier, S.E.; Pulsifer, A.H.

doi:10.1016/0009-2509(85)85094-6

Cited by 46 publications

(31 citation statements)

References 2 publications

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“…The most common methods are using reduction (Van der Merwe et al 1999;Ma et al 2010) and/or reducing atmosphere (Diaz-Bossio et al 1985;Kuusik et al 1985) to decompose gypsum. However, these methods have high requirements for the reaction atmosphere and easily form sulfur by-products.…”

Section: Introductionmentioning

confidence: 99%

Production of glass–ceramics from heavy metal gypsum and pickling sludge

Pan

Yang

et al. 2015

Int. J. Environ. Sci. Technol.

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The aim of this investigation was to propose a preparation method of glass-ceramics derived from heavy metal gypsum and pickling sludge, as well as stabilization of Pb, Zn, Cd, As, Hg, Cr and Ni heavy metals. The process consists of the following two stages: the desulfurization of heavy metal gypsum and the preparation of glass-ceramics. Heavy metal gypsum was desulfurized by excess glass powder at 1,473 K and formed calcium silicate and silicon dioxide as intermediate products. The intermediate products, pickling sludge and small amounts of CaO and MgO were used as major raw materials for preparing parent glass. Glass-ceramics was produced by conventional heating method, which included a nucleation stage (973 K, 2 h) and a crystallization stage (1,173 K, 1 h). The main crystalline phase of the obtained glass-ceramics is akermanite (Ca 2 MgSi 2 O 7 ). A high microhardness of 5.3 GPa and a bending strength of 206 MPa, as well as a water absorption lower than 0.13 % were obtained. The leaching of toxic elements in glass-ceramics was much lower than the Environmental Protection Agency 1311 method requirement.

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Section: Introductionmentioning

confidence: 99%

Production of glass–ceramics from heavy metal gypsum and pickling sludge

Pan

Yang

et al. 2015

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Their rate expression for reaction (15) is Recently, Dlaz-Bosslo et al (Diaz-Bossio, 1982;Diaz-Bossio et al, 1985;Squler, 1985) reported studies of the reductive decomposition of calcium sulfate using a thermogravimetric analyzer.…”

Section: Reaction Kineticsmentioning

confidence: 99%

“…Effect of compaction pressure on pellet porosity mathematically modeling the reaction (Squler, 1985). Another benefit of using 90 mg pellets was that they were within the 100 mg Recorder…”

Section: Calibration and Adjustment Of Equipmentmentioning

confidence: 99%

“…Previous studies revealed that this was not the case Cor the reductive decomposition oC calcium sulCate. According to Dlaz-Bosslo et al (1985), the porosity Increased from 0.17 to 0.28 at 50% conversion, with little change occurring as the conversion increased beyond this level.…”

Section: Calibration and Adjustment Of Equipmentmentioning

confidence: 99%

“…Disadvantages of using silver were that the analysis had to be done immediately because of rapid oxidation (tarnishing) of silver to less conductive states and that the method was not efficient for magnifications greater than 3000. These conditions Include most of those studied previously (Wheelock, 1958;Swift, 1973;Dlaz-Bosslo et al, 1985), and are based on several practical limitations. For example, the reaction rate was too slow to study at temperatures lower than 1050*0, and, at temperatures over 1200*C, the reaction rate was known to decrease (Wheelock, 1958), which was of no practical Interest.…”

Section: Quantitative Analysismentioning

confidence: 99%

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